add a rustc::query_stability lint

compiler/rustc_builtin_macros/src/lib.rs

@@ -12,6 +12,7 @@
 #![feature(proc_macro_internals)]
 #![feature(proc_macro_quote)]
 #![recursion_limit = "256"]
+#![cfg_attr(not(bootstrap), allow(rustc::potential_query_instability))]
 
 extern crate proc_macro;